PYREX® Buchner Funnels

These Corning PYREX® glass Buchner funnels are available with a coarse, medium or fine porosity fritted disc with a porosity range which is held toward the maximum pore diameter indicated. The porosity for the pore diameter of the filter is determined in the same manner as specified in ASTM E-128 "Maximum Pore Diameter and Permeability of Rigid Porous Filters for Laboratory Use"The fritted porous filter disc should not be subjected to pressure differential in excess of 1 atmosphere. The top edges of these glass Buchner funnels are beaded.